21980815846 has 16 divisors (see below), whose sum is σ = 36210013200. Its totient is φ = 9924222880.

The previous prime is 21980815793. The next prime is 21980815861. The reversal of 21980815846 is 64851808912.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21980815793 and 21980815802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3349501 + ... + 3356056.

It is an arithmetic number, because the mean of its divisors is an integer number (2263125825).

Almost surely, 2^21980815846 is an apocalyptic number.

21980815846 is a deficient number, since it is larger than the sum of its proper divisors (14229197354).

21980815846 is a wasteful number, since it uses less digits than its factorization.

21980815846 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6705719.

The product of its (nonzero) digits is 1105920, while the sum is 52.

The spelling of 21980815846 in words is "twenty-one billion, nine hundred eighty million, eight hundred fifteen thousand, eight hundred forty-six".